I don't have a set limit of posts per day.. I post as many as I can.. while trying to ensure that I am not repeating posts and being original at the same time as much as possible. I do try to reply to as many posts as is possible.. again no set limits.. I think its fun to be able to share one's opinions and start discussions on issues one feels about for them to be meaningful as against doing a number of them per day :)

I don't think you should force yourself to start new discussions everyday. Because this leads to tedious, unoriginal discussions which makes the site look very chaotic. I think you should post a discussion only when a good idea comes to your head. I always search before opening a new discussion. I don't start too many discussions because most of them already exists!